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libraries/audio-tools/tests-cmake/codec/mp3-helix/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+# set the project name
+project(mp3-helix)
+set (CMAKE_CXX_STANDARD 11)
+set (DCMAKE_CXX_FLAGS "-Werror")
+
+# add_compile_options(-Wstack-usage=1024)
+
+include(FetchContent)
+
+# Add Portaduio for desktop build
+add_compile_options(-DIS_DESKTOP)
+FetchContent_Declare(portaudio GIT_REPOSITORY "https://github.com/PortAudio/portaudio.git" GIT_TAG v19.7.0 )
+FetchContent_GetProperties(portaudio)
+if(NOT portaudio_POPULATED)
+    FetchContent_Populate(portaudio)
+    add_subdirectory(${portaudio_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR}/portaudio)
+endif()
+
+# Build with arduino-audio-tools
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../../.. ${CMAKE_CURRENT_BINARY_DIR}/arduino-audio-tools )
+endif()
+
+# Build with helix 
+FetchContent_Declare(helix GIT_REPOSITORY "https://github.com/pschatzmann/arduino-libhelix.git" GIT_TAG main )
+FetchContent_GetProperties(helix)
+if(NOT helix_POPULATED)
+    FetchContent_Populate(helix)
+    add_subdirectory(${helix_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR}/helix)
+endif()
+
+# build sketch as executable
+add_executable (mp3-helix mp3-helix.cpp)
+# set preprocessor defines
+target_compile_definitions(mp3-helix PUBLIC -DARDUINO -DUSE_PORTAUDIO  -DIS_DESKTOP)
+
+# OS/X might need this setting for core audio
+#target_compile_definitions(portaudio PUBLIC -DPA_USE_COREAUDIO=1)
+
+# specify libraries
+target_link_libraries(mp3-helix portaudio arduino_emulator arduino_helix arduino-audio-tools)
+

libraries/audio-tools/tests-cmake/codec/mp3-helix/mp3-helix.cpp

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+// Simple wrapper for Arduino sketch to compilable with cpp in cmake
+#include "Arduino.h"
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+#include "AudioTools/AudioLibs/PortAudioStream.h"
+#include "BabyElephantWalk60_mp3.h"
+
+MemoryStream mp3(BabyElephantWalk60_mp3, BabyElephantWalk60_mp3_len);
+PortAudioStream portaudio_stream;   // Output of sound on desktop 
+EncodedAudioStream dec(&portaudio_stream, new MP3DecoderHelix()); // MP3 data source
+StreamCopy copier(dec, mp3); // copy in to out
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  dec.addNotifyAudioChange(portaudio_stream);
+  dec.begin();
+
+  portaudio_stream.begin();
+}
+
+void loop(){
+  if (mp3) {
+    copier.copy();
+  } else {
+    auto info = dec.decoder().audioInfo();
+    LOGI("The audio rate from the mp3 file is %d", info.sample_rate);
+    LOGI("The channels from the mp3 file is %d", info.channels);
+    exit(0);
+  }
+}
+